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  1. #include <queue>
  2. #include <utility>
  3.  
  4. template <typename T>
  5. class myqueue {
  6. public:
  7.     myqueue() : q() {}
  8.     myqueue(myqueue const&) = delete;
  9.     virtual ~myqueue() {}
  10.  
  11.     // pushes a copy
  12.     void push(const T& item) {
  13.         q.push(item);
  14.     }
  15.     // pushes the object itself (move)
  16.     void push(T&& item) {
  17.         q.push(std::move(item));
  18.     }
  19. private:
  20.     std::queue<T> q;
  21. };
  22.  
  23. class nocopy {
  24. public:
  25.     // Default constructor
  26.     nocopy() {}
  27.  
  28.     // Move semantics
  29.     nocopy(nocopy&& other) {}
  30.     nocopy& operator=(nocopy&& rhs) {
  31.         nocopy(std::move(rhs)).swap(*this);
  32.         return *this;
  33.     }
  34.  
  35.     // Disable copy semantics
  36.     nocopy(const nocopy& other) = delete;
  37.     nocopy& operator=(const nocopy& rhs) = delete;
  38.  
  39.     void swap(const nocopy& other) {}
  40. };
  41.  
  42. int main() {
  43.     myqueue<int> q1; // compiles fine.
  44.     q1.push(1);
  45.  
  46.     std::queue<nocopy> q2; // compiles fine.
  47.     nocopy nc1;
  48.     q2.push(std::move(nc1));
  49.  
  50.     myqueue<nocopy> q3; // ERROR :(
  51.     nocopy nc2;
  52.     q3.push(std::move(nc2));
  53. }
  54.  
  55.  
  56.  
Success #stdin #stdout 0s 3028KB
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https://ideone.com/hLV2kl
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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